Design of 320 Gbps hybrid AMI-PDM-WDM FSO link and its performance comparison with traditional models under diverse weather conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruhin Chowdhury ◽  
A. K. M. Sharoar Jahan Choyon
Keyword(s):  
Wavelength Division Multiplexing ◽  
Channel Model ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Weather Conditions ◽  
Optical Signal ◽  
Performance Comparison ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Proposed Model

Abstract A comprehensive design is proposed for alternate mark inversion (AMI)-encoded free-space optical (FSO) communication system by hybridizing polarization division multiplexing (PDM) with wavelength division multiplexing (WDM) and its performance is investigated under diverse weather conditions. The WDM transmitter comprises eight channels transmitting 320 Gbps data over the atmospheric turbulent channel considering gamma–gamma (G–G) distribution for the FSO channel model. A PDM-WDM technique not only maximizes the link capacity of the FSO system but also enhances the spectral efficiency (SE) of the system. Besides, the proposed hybrid AMI-PDM-WDM FSO system performance is compared with the traditional AMI-WDM-PDM and AMI-WDM models to demonstrate the advantages of our proposed model for the design of FSO link. It is observed that our proposed hybrid system exhibits excellent performance under diverse weather conditions over the traditional models in terms of Q factor, received optical power, bit error rate (BER), eye diagrams and optical signal-to-noise ratio (OSNR).

Design of 16 × 40 Gbps hybrid PDM-WDM FSO communication system and its performance comparison with the traditional model under diverse weather conditions of Bangladesh

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
A. K. M. Sharoar Jahan Choyon ◽  
Ruhin Chowdhury
Keyword(s):  
Wavelength Division Multiplexing ◽  
Communication System ◽  
Channel Model ◽  
Optical Power ◽  
Weather Conditions ◽  
Optical Signal ◽  
Performance Comparison ◽  
Traditional Model ◽  
Atmospheric Conditions ◽  
Free Space Optical

Abstract A comprehensive design is proposed for free-space optical (FSO) communication system by hybridizing polarization division multiplexing (PDM) with wavelength division multiplexing (WDM) and its performance is investigated under diverse turbulent weather conditions of Bangladesh. Here we consider gamma–gamma (G–G) distribution for the turbulent FSO channel model. Moreover, a PDM-WDM technique not only maximizes the link capacity of FSO system but also enhances the spectral efficiency (SE) of the system. Besides, the performance of this hybrid PDM-WDM FSO system is compared with the traditional model and the proposed hybrid system exhibits excellent performance under diverse atmospheric conditions of Bangladesh. Performance analysis of the proposed model as well as the comparison with the traditional model is described in terms of optical power spectrum (OPS), optical signal to noise ratio (OSNR), bit error rate (BER), Q factor, constellation diagrams, and eye diagrams.

scholarly journals Design and performance analysis of spectral-efficient hybrid CPDM-CO-OFDM FSO communication system under diverse weather conditions

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruhin Chowdhury ◽  
A. K. M. Sharoar Jahan Choyon
Keyword(s):  
Performance Analysis ◽  
Communication System ◽  
Orthogonal Frequency Division Multiplexing ◽  
Channel Model ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Weather Conditions ◽  
Multipath Fading ◽  
Optical Signal ◽  
Free Space Optical

Abstract A comprehensive design is proposed for the free-space optical (FSO) communication system by hybridizing circular polarization division multiplexing (CPDM) with coherent optical orthogonal frequency division multiplexing (CO-OFDM) and its performance is investigated realistically under diverse turbulent weather conditions of Bangladesh. Here, we consider Gamma–Gamma distribution for the turbulent FSO channel model. Moreover, the proposed scheme presents an excellent performance since the CPDM technique not only maximizes the link capacity of the FSO system but also enhances the spectral efficiency of the system. Besides, multipath fading, which is appeared during the FSO transmission, is significantly mitigated by OFDM modulation. The outcomes from the simulation confirm the advantages of the proposed hybrid scheme and also it can serve as a reference for the FSO application even in turbulent weather conditions. Performance analysis of the proposed model is described in terms of the optical power spectrum, optical signal-to-noise ratio, bit error rate, Q factor, constellation diagrams, and eye diagrams.

Erbium/Ytterbium-Doped Waveguide Amplifier (EYDWA) for extended reach of Wavelength Division Multiplexing based free space optics system (WDM/FSO)

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Bentahar Attaouia ◽  
Kandouci Malika ◽  
Ghouali Samir
Keyword(s):  
Wavelength Division Multiplexing ◽  
Free Space ◽  
Cost Effective ◽  
Weather Conditions ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Space Optics ◽  
Effective Implementation ◽  
Transmission Distance ◽  
The Cost

AbstractThis work is focused to carry out the investigation of wavelength division multiplexing (WDM) approach on free space optical (FSO) transmission systems using Erbium Ytterbium Doped Waveguide Amplifier (EYDWA) integrated as post-or pre-amplifier for extending the reach to 30 Km for the cost-effective implementation of FSO system considering weather conditions. Furthermore, the performance of proposed FSO-wavelength division multiplexing (WDM) system is also evaluated on the effect of varying the FSO range and results are reported in terms of Q factor, BER, and eye diagrams. It has been found that, under clear rain the post-amplification was performed and was able to reach transmission distance over 27 Km, whereas, the FSO distance has been limited at 19.5 Km by using pre-amplification.

Investigation and optimization of EYDFA + Raman + EYDFA hybrid optical amplifier for SD-WDM systems in C+L band

2021 ◽  
pp. 2150006
Author(s):  
Anurupa Lubana ◽  
Sanmukh Kaur
Keyword(s):  
Wavelength Division Multiplexing ◽  
Signal To Noise Ratio ◽  
Fiber Amplifier ◽  
Optical Amplifier ◽  
Optical Signal ◽  
Channel Spacing ◽  
Channel System ◽  
Wavelength Division ◽  
Gain Variation ◽  
Hybrid Optical Amplifier

In this paper, we present a novel erbium–ytterbium doped fiber amplifier (EYDFA) + Raman + EYDFA hybrid optical amplifier (HOA) for a super-dense wavelength division multiplexing (SD-WDM) system application. The performance of the 100-channel system has been investigated for an overall data rate and channel spacing of 100[Formula: see text]Gb/s and 0.4[Formula: see text]nm, respectively, over a wavelength span of 1550–1589.9[Formula: see text]nm. HOA has been optimized for Raman length, EYDFA lengths, pump powers and Er[Formula: see text] concentrations to achieve high average gain and low gain variation ratio of 40.41[Formula: see text]dB and 0.40[Formula: see text]respectively. The optimized configuration of the proposed HOA has been compared with EYDFA + Raman and Raman + EYDFA HOA configurations. The achieved high and flat gain with an acceptable output optical signal to noise ratio (OSNR) in case of EYDFA + Raman + EYDFA HOA; makes it an optimum choice for SD-WDM systems.

A Comparative Analysis of Dual-Order Bidirectional Pumping Schemes in Optical Fiber Raman Amplification

2019 ◽  
Vol 40 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Kulwinder Singh ◽  
Manjeet Singh Patterh ◽  
Manjit Singh Bhamrah
Keyword(s):  
Comparative Analysis ◽  
Fiber Length ◽  
Noise Figure ◽  
Signal To Noise Ratio ◽  
Optical Power ◽  
Optical Signal ◽  
Input Power ◽  
Q Factor ◽  
Wavelength Division ◽  
First Order

Abstract In this paper, dual-order bidirectional pumping schemes of distributed fiber Raman amplifier are compared with standard first-order pumping in wavelength division multiplexed optical transmission systems. The novel comparison analysis is carried out in terms of Optical signal-to-noise ratio and Q-factor, on-off gain and noise figure by varying optical input power and fiber lengths. The results indicate that dual-order schemes present 0.02 dB higher OSNR and 5 dB higher Q-factor in comparison to first-order pumping when input optical power is varied from −4 to 5 dBm. Similarly, there is 4 dB higher on-off gain with dual order comparatively to first order when fiber length varied from 10 to 100 km. However, there is degradation in noise figure and Q-factor due to DRBS noise with dual-order pumping when fiber length from 10 to 100 km. Further, the signal power evolutions along fiber length show that there is 5 dBm improvement for 100 km fiber. The novelty of the work is that comparative analysis exhibits improvement in OSNR, on-off gain and Q-factor using dual-order bidirectional pumping.

High-Speed 120 Gbps AMI-WDM-PDM Free Space Optical Transmission System

2019 ◽  
Vol 40 (4) ◽  
pp. 429-433 ◽  
Author(s):  
Kamal Kishore Upadhyay ◽  
Saumya Srivastava ◽  
N. K Shukla ◽  
Sushank Chaudhary
Keyword(s):  
Wavelength Division Multiplexing ◽  
Free Space ◽  
Communication Systems ◽  
High Speed ◽  
Signal To Noise Ratio ◽  
Low Cost ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Received Power ◽  
Polarization Division Multiplexing

Abstract Free space optical (FSO) communication systems are gaining high popularity from the last decade due to its various advantages such as no license spectrum, low-cost implementation etc. In this work, 160 Gbps data is transmitted over 8 km FSO link by adopting alternate mark inversion (AMI), wavelength division multiplexing (WDM) and polarization division multiplexing (PDM) schemes. The results are reported in terms of Q factor, bit error rate, signal to noise ratio, total received power and eye diagrams.

Performance enhancement of ultra-dense WDM over FSO hybrid optical link by incorporating MIMO technique

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Rajneesh Kumar ◽  
Love Kumar
Keyword(s):  
Wavelength Division Multiplexing ◽  
Data Transmission ◽  
Free Space ◽  
Performance Enhancement ◽  
Transmission Rate ◽  
Weather Conditions ◽  
Optical Signal ◽  
Optical Data ◽  
Free Space Optical ◽  
Modulation Formats

AbstractFree-space optical (FSO) communication is a wireless optical data transmission technology with a high data transmission rate. It has received much attention in recent years as it is cost-effective and has license free operation. It is line of sight free-space communication technique where optical signal severely degraded from atmospheric losses especially due to weather conditions; hence it restricts the link range and data carrying capacity. Therefore, a 16-channel ultra-dense wavelength division multiplexing–free space optics (UWDM–FSO) system each having each 10 Gb/s data rate is proposed to enhance the capacity and performance of FSO system. To authenticate the performance of the proposed system, investigation for different modulation formats such as nonreturn to zero (NRZ), return to zero (RZ), carrier suppressed return to zero (CSRZ) and duo binary (DB) are reported. Further, to reduce the atmospheric interference, multiple input multiple output (MIMO) technique is integrated into the proposed system. The outcomes of MIMO–UWDM–FSO link revealed a significant improvement in the bit error rate (BER), eye diagram and Q-factor, under different weather conditions. It is also observed that NRZ modulation formats perform better than RZ, CSRZ and DB formats.

scholarly journals FSO Communication: Benefits, Challenges and Its Analysis in DWDM Communication System

2020 ◽  
Vol 9 (02) ◽  
Author(s):  
Muhammad Faisal Nadeem Khan ◽  
Haleema Khalil ◽  
Farhan Qamar ◽  
Mudassar Ali ◽  
Romana Shahzadi ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Communication System ◽  
Research Work ◽  
Weather Conditions ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Transmitter Power ◽  
Evolving Networks ◽  
Link Performance ◽  
Amplifier Gain

 Free-space optical (FSO) communication is one of the choice of researchers for most of the bandwidth hungry applications in evolving networks where the deployment of optical fiber is not directly possible as a transmission medium. In this research article, benefits, challenges, applications and role of FSO is discussed in detail for evolving networks. Further, performance of FSO communication system is tested using four channels of dense wavelength division multiplexing (DWDM). Various simulations are performed on FSO including different weather conditions, that directly affect the link performance. Many important parameters such as distance, data rate, bit error rate, amplifier gain, transmitter power, and attenuation under different weather conditions are tested in this research work. The operation of FSO communication system is carried out in the range 760-850 nm where equal channel spacing is considered for the working of DWDM communication system. Moreover, a fair comparison of proposed system is also presented for its operation in two more bands i.e. C and L-band, to show which one offers better performance. Simulation are performed in licensed version of Optisystem 14.0 and MATLAB. For the analysis of proposed system, results are presented in the form of BER and Q-factor plots.

A Novel Architecture of N × N Bidirectional Reconfigurable Multiwavelength Optical Cross Connect

2020 ◽  
Vol 41 (2) ◽  
pp. 133-138
Author(s):  
Manpreet Singh
Keyword(s):  
Wavelength Division Multiplexing ◽  
High Speed ◽  
Signal To Noise Ratio ◽  
Optical Amplifier ◽  
Optical Signal ◽  
Fiber Nonlinearities ◽  
Wavelength Division ◽  
Optical Cross Connect ◽  
Optical Circulator ◽  
Cross Connect

AbstractA novel architecture of N×N bidirectional-reconfigurable multiwavelength optical cross connect (B-RMOXC) based on tunable Fiber Bragg grating and optical circulator is proposed. B-RMOXC network is one of crucial network element for wavelength routing in dense wavelength division multiplexing system. This paper presents a high speed, power compensated bidirectional optical cross connect and verified the performance of bidirectionality with 0.8-nm channel spacing having bit rate of 10 Gbps at different transmission distances. Optical signal-to-noise ratio of 36.62 dB and 35.55 dB is achieved with acceptable Quality factor of 6.26 and 6.99 respectively for upstream and downstream at 60 km having input transmission power of −12 dBm. It is found that the data can be communicated bidirectionally to a distance of 60 km in the presence of fiber nonlinearities without optical amplifier.

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